Zynga - The social-media game maker posted quarterly results that missed estimates and handed in 2012 guidance that disappointed investors, sending shares plunging almost 40 percent. In addition, at least three brokerages cut their price targets on the firm, while JPMorgan lowered its rating to "neutral" from "overweight."

Facebook shares were also sharply lower, ahead of the company's earnings report after the closing bell Thursday.

Groupon - Evercore Partners lowered its rating on the daily-deal site to "equalweight" from "overweight."

Visa - The credit-card provider posted earnings that beat expectations and boosted its full-year earnings outlook for the second time this year. The company also added that it was not seeing signs of a slowdown. At least three brokerages raised their price targets on the firm.

Apple - Exane BNP Paribas cuts its price target on the iPhone maker to $690 from $730, a day after the tech giant posted disappointing quarterly results and a weaker-than-expected outlook.

Sprint Nextel - The telecommunications service provider posted a wider-than-expected loss and reported a decline of 246,000 subscribers in the quarter.

PulteGroup - The homebuilder reported earnings that topped estimates and a sharp increase in new orders, helped by some stabilization in the housing industry.

Dow Chemical - The chemical maker posted a sharp decline in earnings, hurt by falling international sales, especially in Europe.

United Technologies - The company agreed to sell its industrial units to Carlyle Group and BC Partners for $3.46 billion.

Boston Scientific - The medical device maker posted a quarterly net loss due to charges related with its Europe, Middle East and Africa unit.

Mead JohnsonNutrition - The baby-formula producer posted earnings that beat estimates, but handed in a full-year forecast that was below expectations amid slowing growth in China.

Kimberly-Clark - The consumer-products company topped earnings expectations and boosted the high end of its 2012 guidance, as ongoing cost cutting helped overcome weak sales growth.

Boeing - Mexico's largest airline Aeromexico placed an $11 billion provisional order with the airplane maker, marking one of the biggest aircraft investments by a Mexican airline.

Suncor Energy - The integrated oil producer's CEO said the company is revisiting plans for a massive expansion of its oil sands operations as it looks to increase profits.